INFRARED SYSTEM WITH TWO VISION FIELDS Russian patent published in 2017 - IPC G02B13/14 

FIELD: physics.

SUBSTANCE: infrared system with two vision fields consists of the first component arranged along the optical axis, comprising the first positive and the second negative convexo-concave lens, the second component comprising a biconcave lens and adapted to move along the optical axis, the third component comprising a biconvex lens, the fourth component comprising the first concave-convex and the second convex-concave positive lenses, the third negative convex-concave and the biconvex lenses, and a photoreceiver with a cooled diaphragm. In the space between the third and the fourth components, an intermediate image is formed. For the focal lengths f'_I and f'_IV of the first and the fourth components, respectively, and the maximum focal length of the system f'_max the following relations are performed: 0.6<f'_I/f'_max<0.72; 0.08<f'_IV/f'_max<0.2.

EFFECT: due to the constructive execution of the infrared system with two vision fields, the energy concentration is increased with a minimum focal length, which ensures high quality of the system image and improves its detectability.

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